Reference series R4 is a 10 cm (4") 2-way component with an excellent sound in a small size. 

Features 

• Powerful magnet system.
• Crossovers with selectable tweeter level.
• 20 mm silk dome tweeter T20.
• Grilles are included.

 
Specifications

• Woofer size: 10 cm (4")
• Tweeter: T20, 20 mm (0.8") silk dome tweeter
• Power handling capacity: 50 W RMS / 80 W max
• Impedance: 4 ohm
• Frequency range: 65 - 20 000 Hz
• Sensitivity: 94 dB (1W/1m)
• Crossover: Box filter with 6/6 dB slope (LP/HP)
• Crossover point (Hz): 6000 Hz
• Size of filter box: 125 x 44 x 35 mm (4,92 x 1,73 x 1,38")
• Outer diameter of woofer: 100 mm (4")
• Magnet size: 80 mm (3,15")
• Mounting depth: 60 mm ( 2")
• Mounting hole: 102 mm (4")